In 2011, total financial flow from developed economies to developing economies was $577 BOf this, 80% ($461 B) was private flowOf this, total private philanthropy was 13% ($59 B)The total flow from the US alone was $278.5 B Of this, about 90% ($251 B) was private flowOf this, total private philanthropy was 15.5% ($39 B)
Reference:
[Index of Global Philanthropy and Remittances, 2013]